I purchased the car in about every piece possible, already stripped and dipped. The shakers are the correct ones.
As for cleaning the slot out, it's spotless, from the stripping process, but good idea about having somethin in there to keep things from going in. Perhaps some of that high density grey foam (like they use in photo equipment travel boxes) cut to fit would work well and look good.
I painted my shakers chassis black then spattered them while out for better coverage, but may not have been the best idea.
Goin down in a half hour to shoehorn them in, will let ya know how it goes.